Every FBS school starts off with 100 marbles, plus 10 bonus marbles for every game on their schedule against a power conference opponent or Notre Dame
Beat your opponent at your home place or neutral site (including conference championships), take 20% of their marbles; beat your opponent at their home place, take 25% of their marbles
Fractional marbles are rounded to nearest whole number. For example, if you beat an opponent with 210 marbles at their place, you would get 25% of their 210, 52.5, which would be rounded up to 53.
If you beat an FCS opponent, you get nothing. If you lose to an FCS opponent, they get 25% of your marbles. Because FU coward.

Rankings

Marble Rank	Team	Marbles	Conference
1	Ohio State	634	Big Ten
2	Indiana	568	Big Ten
3	Oregon	559	Big Ten
4	Georgia	546	SEC
5	Texas Tech	545	Big 12
6	BYU	515	Big 12
7	Oklahoma	502	SEC
8	Notre Dame	474	FBS Independents
9	Ole Miss	468	SEC
10	Utah	459	Big 12
11	Alabama	433	SEC
12	Texas A&M	426	SEC
13	Texas	401	SEC
14	Vanderbilt	389	SEC
15	Miami	386	ACC
16	Arizona	380	Big 12
17	Virginia	366	ACC
18	USC	344	Big Ten
19	Tulane	291	American Athletic
20	Michigan	279	Big Ten
21	TCU	269	Big 12
22	James Madison	263	Sun Belt
23	North Texas	259	American Athletic
24	Arizona State	253	Big 12
25	Wake Forest	244	ACC
26	SMU	238	ACC
27	Houston	236	Big 12
28	Duke	232	ACC
28	Pittsburgh	232	ACC
30	California	226	ACC
31	Navy	225	American Athletic
31	New Mexico	225	Mountain West
33	Georgia Tech	224	ACC
34	Iowa	221	Big Ten
34	Iowa State	221	Big 12
36	UConn	213	FBS Independents
37	NC State	208	ACC
38	Illinois	206	Big Ten
39	UNLV	200	Mountain West
40	Clemson	197	ACC
41	South Florida	191	American Athletic
42	Washington	184	Big Ten
43	Kennesaw State	181	Conference USA
44	San Diego State	180	Mountain West
45	Old Dominion	174	Sun Belt
46	Louisville	172	ACC
47	Western Michigan	164	Mid-American
48	Minnesota	162	Big Ten
49	Tennessee	157	SEC
50	Toledo	150	Mid-American
51	Jacksonville State	149	Conference USA
52	Hawai'i	148	Mountain West
53	Kansas State	145	Big 12
54	Nebraska	144	Big Ten
55	Missouri	143	SEC
56	East Carolina	142	American Athletic
57	Cincinnati	140	Big 12
58	LSU	138	SEC
59	Boise State	136	Mountain West
60	Fresno State	135	Mountain West
61	Penn State	133	Big Ten
62	Ohio	131	Mid-American
63	Troy	123	Sun Belt
64	Florida International	122	Conference USA
65	Army	115	American Athletic
66	Western Kentucky	114	Conference USA
67	Northwestern	112	Big Ten
68	Memphis	111	American Athletic
69	Wisconsin	103	Big Ten
70	UTSA	98	American Athletic
71	Louisiana Tech	97	Conference USA
71	Miami (OH)	97	Mid-American
71	Texas State	97	Sun Belt
71	West Virginia	97	Big 12
75	Central Michigan	91	Mid-American
76	Arkansas State	85	Sun Belt
76	Georgia Southern	85	Sun Belt
78	Missouri State	84	Conference USA
79	Florida State	82	ACC
79	Southern Miss	82	Sun Belt
79	Utah State	82	Mountain West
82	Stanford	81	ACC
83	Louisiana	79	Sun Belt
84	Florida	75	SEC
85	Baylor	74	Big 12
86	Washington State	73	Pac-12
87	Kentucky	72	SEC
88	Coastal Carolina	68	Sun Belt
89	Kansas	65	Big 12
90	Delaware	62	Conference USA
91	Rutgers	60	Big Ten
92	UCF	58	Big 12
93	South Carolina	55	SEC
94	Akron	54	Mid-American
94	Kent State	54	Mid-American
96	Auburn	52	SEC
96	UCLA	52	Big Ten
98	Mississippi State	50	SEC
98	UAB	50	American Athletic
100	Rice	49	American Athletic
101	Virginia Tech	48	ACC
102	Tulsa	47	American Athletic
103	Michigan State	46	Big Ten
103	North Carolina	46	ACC
103	South Alabama	46	Sun Belt
106	Colorado	44	Big 12
106	Marshall	44	Sun Belt
108	Eastern Michigan	43	Mid-American
109	Air Force	40	Mountain West
110	App State	37	Sun Belt
110	Ball State	37	Mid-American
110	Maryland	37	Big Ten
110	Temple	37	American Athletic
114	Buffalo	34	Mid-American
115	Liberty	31	Conference USA
115	Middle Tennessee	31	Conference USA
115	Nevada	31	Mountain West
115	San José State	31	Mountain West
119	Wyoming	30	Mountain West
120	Austin Peay*	28	UAC
120	Florida Atlantic	28	American Athletic
120	Syracuse	28	ACC
120	Tarleton State*	28	UAC
124	Bowling Green	27	Mid-American
124	Sam Houston	27	Conference USA
126	Boston College	24	ACC
127	Bryant*	23	CAA
128	Long Island University*	22	NEC
128	New Mexico State	22	Conference USA
130	Northern Illinois	21	Mid-American
131	Oregon State	20	Pac-12
132	UL Monroe	18	Sun Belt
133	Arkansas	16	SEC
133	Colorado State	16	Mountain West
133	Purdue	16	Big Ten
136	Oklahoma State	11	Big 12
137	UTEP	10	Conference USA
138	Charlotte	7	American Athletic
138	Georgia State	7	Sun Belt
140	Massachusetts	5	Mid-American

* FCS